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Using HLSL's [Inline SPIR-V](https://microsoft.github.io/hlsl-specs/proposals/0011-inline-spirv.html) features, users have the ability to use [`SpirvType`](https://microsoft.github.io/hlsl-specs/proposals/0011-inline-spirv.html#types) to have fine-grained control over the SPIR-V representation of a type. As explained in the spec, this is useful because it enables vendors to author headers with types for their own extensions. As discussed in [Target Extension Types for Inline SPIR-V and Decorated Types](https://github.com/llvm/wg-hlsl/pull/105), we would like to represent the HLSL SpirvType type using a 'spirv.Type' target extension type in LLVM IR. This pull request lowers that type to SPIR-V.